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What color is used as the background for stop, yield, do not enter and wrong way messages?
The answer
Answer: C. Red is used for stop, yield, do not enter and wrong way messages. Red is used only as a background color for STOP signs, ALL WAY plates, DO-NOT-ENTER and WRONG WAY signs and on Interstate route markers, and as a legend color on YIELD and parking prohibition signs.
Source: Tennessee Comprehensive Driver License Manual — Section B, Chapter 3: Sign Colors, p. 35